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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14775adc6cca88dbd1c909a1222276d0b1db01a2bdfb28bce0099b2847f52681' 
  AND token = 'o+bSb9y9XInl0ZLneD+1Uryl+yLV2we3J0Bqkl5Lb68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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