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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1e09f6dd55d0f1a1dcc674953c1a4e3b6f35e756ec984a445eaa5c84119d35' 
  AND token = 'AcUcez9dOVBVszkimfWaBleb9pBNHgHW0w+2p5KJAhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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