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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d01bcbf6484d868c507c060bc799dcd7f55c77783ec5242c495dbbd38334ff' 
  AND token = '99bo0caTpc5fKVbJssfsGu608jQoDCDwjT1UApUr5MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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