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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933333dca463322882b4a56ce7d567de46d1473b65c120a189c97e8c2b64e956' 
  AND token = 'AsvwLHeNdAz30akDPe0ykouyYK4m0FRNzo/jxWT7UXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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