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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472bbeedce3e0103f7692bf27c44c7e7a172f2def7153713337a44fe2b31563c' 
  AND token = 'CcYoSk/7J3f5g3RrMyNZRCuAMKBSTlOk3tBwCuk3HkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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