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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9fcb5623a9c16581e8bc96dec60320a6b985defcb9ea4d1cd5b7760fb7a65d' 
  AND token = 'Xe0ZMhqzRsL+MRD6/9L0Izl8Ppkm4V83uvKkP6h5Crg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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