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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f21d7a9cc60ffe3f19b17d13c412872c06a18e96ec1ffac0dd18d7f090ca88' 
  AND token = 'cPhXcX56vUfUK+RKnEj+2yXySDdmR9UK3suYsR/5VVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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