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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1fcfb12971aec9e7854767e23f4f61ef3f25a079773b95b1bb2a45b2e03954' 
  AND token = '1hE16UYe1V8Oak4F88+T5k41PnwycX/R6Qpl3Bt280Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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