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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25a99ede74a554cdfd04aef422ff3aa2a7e24e1fd63691a831090ed9264072d' 
  AND token = 'mirvPXRxtHglWB5WFBhxoJhFXKfbfHZzl7ibuKwepOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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