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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec0fd44b08fa25db3885a9295ed6f71d18b37c4a5f48e93fca3a09545f668e6' 
  AND token = '5oXd2LahSGQ5sAwwk29FstJQdBEubtxvzCA9smKXufg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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