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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c15c3f047648cc068a72437c541caa581bc2f97e6071b62e0500e41f6eb5d98' 
  AND token = '8NNllBcH1bqYfslBMRO6l2DBATHotDh/4sYvHxK2Lmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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