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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83d1b27eab88bce048868104d867615c14567125baee340f0cae1406e9b3413' 
  AND token = 'ide3Sak2DOYTvDzmFE7zF3p/oNo0J1xPY697xQUD0ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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