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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5b520c17a9c56a25e52f9b22d7545c01d28a69fd2d3fcf96de150a97658d19' 
  AND token = 'h14GBhozlKl7MNtvpJ5toVEFAsBnvTD0IiPXSKFixRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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