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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bcf649bdb2e779393b9ba5be979f45339920ee868fa9b7d87a88cd8db9a65c' 
  AND token = 'G/gIwWL88d4V6cnccSYSofyacmP11K1vPdNyxwF7PYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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