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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f8e36fef159ebb08758ff2522a6539ca8082d9a6ac26486622567b1c4b7c04' 
  AND token = 'J1XwtASc/uS6ziEHN0yRC5bOTagTVOQq9ix1MvKKqh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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