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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb02de907cf60ec84db63da699822fb16febb3bc5c77d6bc1a12e5fc5d75b08' 
  AND token = '04A35wy/2wdj4mab1/GMtomnSOVAaAgCAbstMhYpVX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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