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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb80f625ba53e0834098a8fc8b530e538b64e99ef0b89fc38f06cec0f42ab1c' 
  AND token = 'apMYcinf2qWmmCrpFx+/vxc7MIToA2kMuNjVG9B141c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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