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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c247204478c02febd1569fd1ebc35be5cd49c6a70ce2dfc6cf7ce8f1e960043' 
  AND token = 'EkbpBn1uVOZra7cevjZe7hOjwt+X21HdI1tZzqFcbFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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