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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c58fb15a2076e2a603ff3501f48f07bb558c5dff259ec33be8915e71f931030' 
  AND token = 'XzQUNNCZRMsPuyAScF8AoSghRieuYqdD8sfCiwVsuy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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