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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0023bb7de7316c83c61a718a701059af1e3c8eaf9c272611f5d967bf0b1f18ba' 
  AND token = 'o9ye6Yn5/P3bJ6pNXfIa5e8IFVbJ0csgtkGgCsE18BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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