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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92a3d7ff0355f31e152b1aaf4d0c7e520e8cf2399a29ece0ce09ccb2d1e8b20' 
  AND token = 'e26VbjwRP/wdpm7bWtqo+1wfmrrsfqAdqk12bCC7yr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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