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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83204932d218885a3f83803ce6bdb0b77af8d95e8a4bfa2fb46929c552a72b02' 
  AND token = 'OvQuK+pDEfpFE99b9MS/NFNlcYPEpI/2zPcw0t+m3kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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