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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44bf2732ac94be5e5aaa2457a0d2f53a963d47b3ba3226d42fe426f1ed0a0d1' 
  AND token = 'jAQADWaMefIgMBcLWiwPCXnrBPiSGRCsuO4u6tjuG2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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