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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3bb592fabc3883166453dd8e3d6220414f2a1a76b39d325597e1edc2274080' 
  AND token = '94yQhkD3+IJyMR6e612wvFPA8rwMZcgXhov/WjU6gRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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