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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80731d2bfe41c1c32f47a96b2ed3df90167c74272a9c532d8b46ae45270df59d' 
  AND token = 'PjHyUW3q50L+wfV1yxcs4l1BMGagdu6kkVQSfUhCl2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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