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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9dea39ac2c1cee210c3c22665bb31bda00f6efb7c9b2720130d98000c3902d' 
  AND token = 'U5tFOGDllwTKajm33aoq3GgEGGe5fuIBc+9t8Q78/RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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