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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea3348c825d62dde73c1f592b0ef1d232eaf99afe53d0ee666e4692b3ce26bb' 
  AND token = 'y4eP5UfNupNgCUuv5v7a/dXUTJ4e2pLIqVPTgiQ5ohg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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