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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e8974d54ea938f6ea74cd8ed2d6c4ccd3e566f963b9fd7cf63dbe92a8fbd47' 
  AND token = 'xZy+2PIcfxpxPTZmm2FDh7qClVkaUU5EEB+aYNSucEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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