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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4ee3a8f9e4317ae37f9f8a01c0feaee9c34232c6ce9b2b3d3ec40a9d7b4305' 
  AND token = 'S9s9kFARZSU/URkC9D6LTOp5/N97xJPgQv4EfH4zmf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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