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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93aca31813245f071415e1dad275712e7f9d32248ea53d8defe525f340249d98' 
  AND token = 'zjps32gVjtI89/4RME1cd6NCKdeIKhvequ2JFOk2W0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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