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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58212673d89304d17d7e746d3e58e59fcd0c5291d53784cc59679128179e26e2' 
  AND token = '8lRY5HZ+NNo1ynzCD1649sizOWtbKEENXy1AsT3tX2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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