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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aff5234d301fe886af3ddc0bdc38446f7b70f8aceafe6f23505e9fd05ca53be' 
  AND token = '9i+igy6xbzxTHSXZx7/Ennjn84eQJP+KqqaIso9qZM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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