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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc8461950f303a87a48bb444ff44054af0d01b5f394b8937ba529e425381e6c' 
  AND token = 'pNs8XYxaUe246uBRsrRukxnT2DVp/rCY9L4SnyhFUT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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