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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31be02ef9f3cbe50a904b306cbce5e2e4eb032b2277f6968fdcfc81f65d693b9' 
  AND token = 'hKGR2MO5FkT4E7uZtZgTh2Cl8ybaAILIlY8rY2B9Fo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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