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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc31e5bad13bfcc8f2167188925c3ed657608475598552b60260e118486b154' 
  AND token = 'Ct+AlVCgG88JYUKEx15g3/6YzTSe+uHoRCmzATmeTyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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