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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa77d3e841c05cb23c2820230b809d6b34a3e588a394d263cfbe17119d0a2828' 
  AND token = 'yqTmFAjfr1HZ0PHu3G1J4HC4qOntsPLXwB47WBb+nvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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