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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0304e51c504df4938afb7cca58aaa867b9e93e4383c3a956f078212f52b4e9d0' 
  AND token = '2dIHYH+osK5vYOsi1ZcTU2IBDjEFrTnMoVfGzKN2rEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}