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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b761105074891cca90433c524a0708c3ee421a8bf1956b849a77a1f4edb63d' 
  AND token = 'M468S8BxMnwmeJZ2TtVM6GWvqFbwDTXa9GknpNdbfpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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