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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49849ae4f294a60c4e80ffb62f70f839358850c9537ce23d1c98e35a6a0c75e' 
  AND token = 'DahkUyyka3yEBh1QCil5cNj5N0F5EXNn3JVIk2lpIpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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