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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b030c089c4ebaf2ec040e91bc18d1dc0ae269bcb2bbce2db7484b147b8402b' 
  AND token = 'uRvbiXTKIuPV2OmcpymKnjf+uDhvJ4GGax0k7HtZzOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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