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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6306345ec252fbc5cecd4255c0c783049601843f5c04c30d09126b5687623de8' 
  AND token = 'UL8mh5pz8NCHkSxzlUmREky9h2Kf7YOF31selhvWrow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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