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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6ffedf58948dd6e0c82494012c26216fcfe6855e5d97b2d99130bf0beb32b8' 
  AND token = 'NjZ0IBAbt3o5nXttdozTXsmtCKeUIo9HzGaA0nESFh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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