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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321aa9b5d52932f32cf897b1a7b2d997c939c736546174694b2a90d1735cc008' 
  AND token = 'Jo5RX7uOArZw6whGQ++NsAIrDmg6Wg8Zr2qnQy+u9g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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