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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca8556b88a8f75ab2cf01e8f651f505cb094a74ba0a72ff4aac66dd6fbedefe' 
  AND token = 'QOLjJYd22E0s04n0IYY/+8vFZvJq76r1q3tEWWucE4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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