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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820d4762fa330cd2bd76a9ca1177d57095eb3d42d7547ed005f1d59155df4a2b' 
  AND token = 'RtKtHs8PRyqdMRavSieVvnlajafkLGltW08cqx1+Oiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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