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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f37ae3f45f931a7fe1a3e0bbedc7b8038ac2e5e7842eb2140f45fdf6c4900f' 
  AND token = '1za1ivZdtFvxtN72K7toLYaf8R7Q2dM4AEkE2eJ6xTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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