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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca26234b53f858dedd6e9336a4c2cd32c4c9d2cd7cba29030407164260e05e9' 
  AND token = 'sb3AAEJyoGdk04Ud2ZthiW/xIUECBHB3E4QHmqiFiGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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