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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ad02f708c3af07639d543e1e30605946b6e0631d58cc69b4b7c4b2ae798aa0' 
  AND token = '0njCHTmANasF3g1dNtl6UwDRDmwXamtTD3o6na5ErkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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