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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1daa31d2af66d371afb41cc51f4cb662d11953f4106d9b9e181dd1c6c07b30' 
  AND token = 'qcNcRtgbTJWUe1WCAhsnRveSwEEf1qW7Rzw4vo95eg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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