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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098449074f8c48a6f23c20ec1f9c4667b98c6a78d76ccec3697afcf67de27ade' 
  AND token = 'tAGeEFCBqwnx9sp1AyylAU6/64orT3/igO8DZb5Tj0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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