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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03155f2bf309d48b0ee09da95c429754abaa9916a483d507d736aab022a5dfd5' 
  AND token = 'ydOz1rH/+8Pd0Wk3Q6PvUZGi1sgBXafcIJXbgQ+Re58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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