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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cc24a6d59bcee4f77faee304e128b7ad05b96b57db39db9da146e2ed576351' 
  AND token = 'EV5UuDi5IFW7aqsyAz1oqeq3rpUE0tTZiQPFxH8xs1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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