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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fda9e09537045cf4c17bbb3dbcae6d8b9b4a392d78fd099f2f18bd1e4a4155' 
  AND token = 'Y8mtDEuyZGvWTYovZnOcs0qih5SKQ4uIXv2Wd8pZgtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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