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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd028d16aba8c9b1d7773a5fa36ab2e464a52f9d209a7164379d15c1160b17808' 
  AND token = 'FOHRdIP65elEm0YmwFRHL4476E6vUy1c9HdfftUzLug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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