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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362dd4fb7189b3d6cde56c60e06d7315f591ad915a0a8d39adec802d53927971' 
  AND token = '4YYkik1lJR2e35ywdOKHl1G4AQuUKFHfJ/JZEujz1zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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