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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f46d0c55c74da7ad1e4e9c7a7835f994c00870447e4adf4971dd68f66dbd820' 
  AND token = '1GfcUwp72aLThcvfFihU0R18vxYJPSIHB/bj/WoOJ88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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