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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93bacdfaf2db3480d70700f1ebb34be3512990df85fb327673ce4ea024815b4b' 
  AND token = '8+uxr83RKUfZEKocF8mYH1TvL6mHnuW/m5ABNeBvRWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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