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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23694c2b7c73979f904b5a559a3bd2b52c8067cbc663e9badeec227cb0013bff' 
  AND token = 'LpFVMnA4X8pbgpTX9PNM2BoQvPSGMG+tx6gq+yFPnvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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