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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d3267cb7c0167984fdd2690eb802503313ae9f22204788c25ea2b77bfc99f6' 
  AND token = 'fm9fS5qvHT1sy6gSVL50Cph95BV5CxWYzMa3lW7bHDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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