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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89e02a135ecb2bbb1222dd3ae83bc338f04c01fac58e1e5697ba279c2341a84' 
  AND token = 'epNBwExe/Xg7kK88RGnRtlZVm/i22VvGJgqNoNg4ckE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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