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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68ffbdd49618d2be8eda8e341b2fd68471a973e61f8b2193dffe6a42920dd6a' 
  AND token = 'bEhYwpPhlO4p95tz6oMLpsiuhMFbj6Fcg2wmfmLv5WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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