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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0efc8eecd73d29d05e449360965c9d7d9beba15066a2b1ba33d4d29687c92c' 
  AND token = 'zO87G9HcFoMbW8MEd4N/5f8iUYND6RQUpGJdWGt5DRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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