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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d23eac1b7fdcab03597de7f35168ef79a75c5273e1c62dcd74e3f755f42263' 
  AND token = 'tG4VKaAnc64yeh80ivv1V03cXskpEqxd0YLDcf8PATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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