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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad920999a1f9f762b26fb832bc2dd717904c0be7be720ad785c1457bad46756e' 
  AND token = 'Xpd0UmnLNJ3h9hSEpONmSHX4YxtjbqtNr8g9kzwyJRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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