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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e9cf74518fdb8c306d5a2241c7a3f3e1b0ad9b8db7744c711c28a141071b7f' 
  AND token = 'zbPv/2HgD8wLoSlU6BQMSL2/XAnrOreIIDOb/A41Olg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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