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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b698d5c3ce46f21d2b402808f7012a9e682bd2ffbd8c043c14b15f088a9c8d8' 
  AND token = 't+2IJGnvxdohXMn4yTDL5ODtJQl7+GBWrNbpCL7s1xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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