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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1bd43fc588cac4cadfc6eb2a2baefb39516851c5a9126f2edbdb50308a32b7' 
  AND token = 'xgqQI84a+ymL7b3dzKq7t9XffzNBQfpfRWItzkmTy88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00192

JSON explain

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