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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eecd991a3e4fd3f33273f7dc8e1d7cb6c5d4eb751c75d241f80cdd7139ee3bf' 
  AND token = 'OEi/BXgioPw1ZMqTfS3WIg9zMzH1D4P7WtsDz+ZL9hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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