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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b29eb14a4d1ea2eeb05725b542d88728d3c986c7ce49a035727f007fe869d7c' 
  AND token = '+unVseOjlnWiXpoH5S86B5Df0vhGSYAoO+LJx5sU/xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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