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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f545588cfc1593196aaa0beca86529c404cdecc78819abea83810c13f180e2' 
  AND token = 'uvMssXqGYzP2J1EMsxj+s7by8frCw/cfl0Kkd3ZL4J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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